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sre_constants.py
# # Secret Labs' Regular Expression Engine # # various symbols used by the regular expression engine. # run this script to update the _sre include files! # # Copyright (c) 1998-2001 by Secret Labs AB. All rights reserved. # # See the sre.py file for information on usage and redistribution. # """Internal support module for sre""" # update when constants are added or removed MAGIC = 20171005 from _sre import MAXREPEAT, MAXGROUPS # SRE standard exception (access as sre.error) # should this really be here? class error(Exception): """Exception raised for invalid regular expressions. Attributes: msg: The unformatted error message pattern: The regular expression pattern pos: The index in the pattern where compilation failed (may be None) lineno: The line corresponding to pos (may be None) colno: The column corresponding to pos (may be None) """ __module__ = 're' def __init__(self, msg, pattern=None, pos=None): self.msg = msg self.pattern = pattern self.pos = pos if pattern is not None and pos is not None: msg = '%s at position %d' % (msg, pos) if isinstance(pattern, str): newline = '\n' else: newline = b'\n' self.lineno = pattern.count(newline, 0, pos) + 1 self.colno = pos - pattern.rfind(newline, 0, pos) if newline in pattern: msg = '%s (line %d, column %d)' % (msg, self.lineno, self.colno) else: self.lineno = self.colno = None super().__init__(msg) class _NamedIntConstant(int): def __new__(cls, value, name): self = super(_NamedIntConstant, cls).__new__(cls, value) self.name = name return self def __repr__(self): return self.name __reduce__ = None MAXREPEAT = _NamedIntConstant(MAXREPEAT, 'MAXREPEAT') def _makecodes(names): names = names.strip().split() items = [_NamedIntConstant(i, name) for i, name in enumerate(names)] globals().update({item.name: item for item in items}) return items # operators # failure=0 success=1 (just because it looks better that way :-) OPCODES = _makecodes(""" FAILURE SUCCESS ANY ANY_ALL ASSERT ASSERT_NOT AT BRANCH CALL CATEGORY CHARSET BIGCHARSET GROUPREF GROUPREF_EXISTS IN INFO JUMP LITERAL MARK MAX_UNTIL MIN_UNTIL NOT_LITERAL NEGATE RANGE REPEAT REPEAT_ONE SUBPATTERN MIN_REPEAT_ONE GROUPREF_IGNORE IN_IGNORE LITERAL_IGNORE NOT_LITERAL_IGNORE GROUPREF_LOC_IGNORE IN_LOC_IGNORE LITERAL_LOC_IGNORE NOT_LITERAL_LOC_IGNORE GROUPREF_UNI_IGNORE IN_UNI_IGNORE LITERAL_UNI_IGNORE NOT_LITERAL_UNI_IGNORE RANGE_UNI_IGNORE MIN_REPEAT MAX_REPEAT """) del OPCODES[-2:] # remove MIN_REPEAT and MAX_REPEAT # positions ATCODES = _makecodes(""" AT_BEGINNING AT_BEGINNING_LINE AT_BEGINNING_STRING AT_BOUNDARY AT_NON_BOUNDARY AT_END AT_END_LINE AT_END_STRING AT_LOC_BOUNDARY AT_LOC_NON_BOUNDARY AT_UNI_BOUNDARY AT_UNI_NON_BOUNDARY """) # categories CHCODES = _makecodes(""" CATEGORY_DIGIT CATEGORY_NOT_DIGIT CATEGORY_SPACE CATEGORY_NOT_SPACE CATEGORY_WORD CATEGORY_NOT_WORD CATEGORY_LINEBREAK CATEGORY_NOT_LINEBREAK CATEGORY_LOC_WORD CATEGORY_LOC_NOT_WORD CATEGORY_UNI_DIGIT CATEGORY_UNI_NOT_DIGIT CATEGORY_UNI_SPACE CATEGORY_UNI_NOT_SPACE CATEGORY_UNI_WORD CATEGORY_UNI_NOT_WORD CATEGORY_UNI_LINEBREAK CATEGORY_UNI_NOT_LINEBREAK """) # replacement operations for "ignore case" mode OP_IGNORE = { LITERAL: LITERAL_IGNORE, NOT_LITERAL: NOT_LITERAL_IGNORE, } OP_LOCALE_IGNORE = { LITERAL: LITERAL_LOC_IGNORE, NOT_LITERAL: NOT_LITERAL_LOC_IGNORE, } OP_UNICODE_IGNORE = { LITERAL: LITERAL_UNI_IGNORE, NOT_LITERAL: NOT_LITERAL_UNI_IGNORE, } AT_MULTILINE = { AT_BEGINNING: AT_BEGINNING_LINE, AT_END: AT_END_LINE } AT_LOCALE = { AT_BOUNDARY: AT_LOC_BOUNDARY, AT_NON_BOUNDARY: AT_LOC_NON_BOUNDARY } AT_UNICODE = { AT_BOUNDARY: AT_UNI_BOUNDARY, AT_NON_BOUNDARY: AT_UNI_NON_BOUNDARY } CH_LOCALE = { CATEGORY_DIGIT: CATEGORY_DIGIT, CATEGORY_NOT_DIGIT: CATEGORY_NOT_DIGIT, CATEGORY_SPACE: CATEGORY_SPACE, CATEGORY_NOT_SPACE: CATEGORY_NOT_SPACE, CATEGORY_WORD: CATEGORY_LOC_WORD, CATEGORY_NOT_WORD: CATEGORY_LOC_NOT_WORD, CATEGORY_LINEBREAK: CATEGORY_LINEBREAK, CATEGORY_NOT_LINEBREAK: CATEGORY_NOT_LINEBREAK } CH_UNICODE = { CATEGORY_DIGIT: CATEGORY_UNI_DIGIT, CATEGORY_NOT_DIGIT: CATEGORY_UNI_NOT_DIGIT, CATEGORY_SPACE: CATEGORY_UNI_SPACE, CATEGORY_NOT_SPACE: CATEGORY_UNI_NOT_SPACE, CATEGORY_WORD: CATEGORY_UNI_WORD, CATEGORY_NOT_WORD: CATEGORY_UNI_NOT_WORD, CATEGORY_LINEBREAK: CATEGORY_UNI_LINEBREAK, CATEGORY_NOT_LINEBREAK: CATEGORY_UNI_NOT_LINEBREAK } # flags SRE_FLAG_TEMPLATE = 1 # template mode (disable backtracking) SRE_FLAG_IGNORECASE = 2 # case insensitive SRE_FLAG_LOCALE = 4 # honour system locale SRE_FLAG_MULTILINE = 8 # treat target as multiline string SRE_FLAG_DOTALL = 16 # treat target as a single string SRE_FLAG_UNICODE = 32 # use unicode "locale" SRE_FLAG_VERBOSE = 64 # ignore whitespace and comments SRE_FLAG_DEBUG = 128 # debugging SRE_FLAG_ASCII = 256 # use ascii "locale" # flags for INFO primitive SRE_INFO_PREFIX = 1 # has prefix SRE_INFO_LITERAL = 2 # entire pattern is literal (given by prefix) SRE_INFO_CHARSET = 4 # pattern starts with character from given set if __name__ == "__main__": def dump(f, d, prefix): items = sorted(d) for item in items: f.write("#define %s_%s %d\n" % (prefix, item, item)) with open("sre_constants.h", "w") as f: f.write("""\ /* * Secret Labs' Regular Expression Engine * * regular expression matching engine * * NOTE: This file is generated by sre_constants.py. If you need * to change anything in here, edit sre_constants.py and run it. * * Copyright (c) 1997-2001 by Secret Labs AB. All rights reserved. * * See the _sre.c file for information on usage and redistribution. */ """) f.write("#define SRE_MAGIC %d\n" % MAGIC) dump(f, OPCODES, "SRE_OP") dump(f, ATCODES, "SRE") dump(f, CHCODES, "SRE") f.write("#define SRE_FLAG_TEMPLATE %d\n" % SRE_FLAG_TEMPLATE) f.write("#define SRE_FLAG_IGNORECASE %d\n" % SRE_FLAG_IGNORECASE) f.write("#define SRE_FLAG_LOCALE %d\n" % SRE_FLAG_LOCALE) f.write("#define SRE_FLAG_MULTILINE %d\n" % SRE_FLAG_MULTILINE) f.write("#define SRE_FLAG_DOTALL %d\n" % SRE_FLAG_DOTALL) f.write("#define SRE_FLAG_UNICODE %d\n" % SRE_FLAG_UNICODE) f.write("#define SRE_FLAG_VERBOSE %d\n" % SRE_FLAG_VERBOSE) f.write("#define SRE_FLAG_DEBUG %d\n" % SRE_FLAG_DEBUG) f.write("#define SRE_FLAG_ASCII %d\n" % SRE_FLAG_ASCII) f.write("#define SRE_INFO_PREFIX %d\n" % SRE_INFO_PREFIX) f.write("#define SRE_INFO_LITERAL %d\n" % SRE_INFO_LITERAL) f.write("#define SRE_INFO_CHARSET %d\n" % SRE_INFO_CHARSET) print("done")
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